The built-in Calculator floating app can be really useful especially when say you’re on the floating browser and need to do a quick calculation but stay viewing that video or article for example. The app is great in any situation really!
Here after pressing the 3 bars you can see some options. The History option will basically be able to keep your recent calculations just like browser history and you can filter by typing in certain numbers or whatever else you may require.
The functions option will allow you to add in any mathematical functions that you may require to get your end result! Just tap on any and they will be inputted into the calculator. And the other options will do exactly what it reads. Don’t forget to get the best size and position for your needs, just move and resize the window to do this and save it.